KR-20260067997-A - DRIVE UNIT

KR20260067997AKR 20260067997 AKR20260067997 AKR 20260067997AKR-20260067997-A

Abstract

[Task] Suppress mass imbalance on the left and right sides of the drive unit. [Solution] A driving unit for a vehicle comprises a first motor, a first reduction gear, a first inverter, a second motor, a second reduction gear, and a second inverter, a locking mechanism for mechanically locking and unlocking the first reduction gear, and a casing that accommodates them. When the driving unit is mounted on a vehicle, the casing has a first part disposed on one side of a pair of left and right wheels and a second part disposed on the other side of a pair of left and right wheels. The first motor, the first reduction gear, the first inverter, and the locking mechanism are disposed in the first part of the casing, and the second motor, the second reduction gear, and the second inverter are disposed in the second part of the casing. The motor center plane that divides the space between the first motor and the second motor may be offset toward the second part of the casing with respect to the inverter center plane that divides the space between the first inverter and the second inverter.

Inventors

스즈키 유스케
오쿠다 고이치
이토 에이지
사이토 나오키

Assignees

도요타지도샤가부시키가이샤

Dates

Publication Date: 20260513
Application Date: 20251103
Priority Date: 20241106

Claims (10)

It is a vehicle drive unit that drives a pair of left and right wheels independently, and A first motor that drives one side of the above pair of left and right wheels, and A first reduction gear for reducing the rotation of the first motor, and A first inverter electrically connected to the first motor, and A second motor that drives the other side of the above pair of left and right wheels, and A second reduction gear that reduces the rotation of the second motor, and A second inverter electrically connected to the second motor, and A locking mechanism that mechanically locks and unlocks the first reduction gear, and A casing accommodating the first motor, the first reduction gear, the first inverter, the second motor, the second reduction gear, the second inverter, and the lock mechanism Equipped, The above casing has a first part disposed on one side of the pair of left and right wheels when the drive unit is mounted on a vehicle, and a second part disposed on the other side of the pair of left and right wheels. The first motor, the first reduction gear, the first inverter, and the lock mechanism are disposed in the first part of the casing, and The second motor, the second reduction gear, and the second inverter are disposed in the second part of the casing, and A driving unit in which the motor center plane dividing the space between the first motor and the second motor is offset toward the second part of the casing with respect to the inverter center plane dividing the space between the first inverter and the second inverter.
In paragraph 1, The above casing has a first oil pan provided at the bottom of the first part and a second oil pan provided at the bottom of the second part, and A drive unit in which the oil pan center plane dividing the space between the first oil pan and the second oil pan is offset toward the first part of the casing with respect to the motor center plane.
In paragraph 1, The above drive unit is connected to a first drive shaft connected to one side of the pair of left and right wheels, and a second drive shaft connected to the other side of the pair of left and right wheels. The center of gravity of the above-mentioned drive unit is located on an inboard center plane that equally divides the space between the first drive shaft inboard of the first drive shaft and the second drive shaft inboard of the second drive shaft.
In paragraph 1, The above-mentioned drive unit is, A first terminal block fixed to the above casing, and A first conductive path that electrically connects the first inverter and the first motor through the first terminal block, and A second terminal block fixed to the above casing, and Further comprising a second conductive path that electrically connects the second inverter and the second motor through the second terminal block, The total length of the first challenge path and the total length of the second challenge path are different from each other, A driving unit in which the length of the section from the first motor to the first terminal block of the first conductive path and the length of the section from the second motor to the second terminal block of the second conductive path are equal to each other.
In any one of paragraphs 1 through 4, The first motor and the second motor are a driving unit arranged symmetrically with respect to the center plane of the motor.
In any one of paragraphs 1 through 4, The first inverter and the second inverter are a driving unit arranged symmetrically with respect to the center plane of the inverter.
In any one of paragraphs 1 through 4, The above casing is, A first motor room located in the first part above, accommodating the first motor and the first reduction gear, and A second motor room located in the second part above, accommodating the second motor and the second reduction gear, and A drive unit having a motor room partition located on the motor center plane and at least partially isolating the first motor room and the second motor room.
In Paragraph 7, The above casing is, A first inverter room that accommodates the first inverter, located in the first part above, and A second inverter room that accommodates the second inverter, located in the second part above, and A driving unit having an inverter room partition located on the central plane of the inverter and at least partially isolating the first inverter room and the second inverter room.
In paragraph 1 or 2, The above lock mechanism is a drive unit provided on a rotating shaft connecting the first motor and the first reduction gear.
In Paragraph 9, The above lock mechanism is, A lock gear fixed to the above-mentioned rotational shaft, and A drive unit having a lock pawl movable between a lock position that engages with the lock gear and an unlock position that releases the engagement with the lock gear.

Description

Drive Unit The technology disclosed in this specification relates to a drive unit for a vehicle. Patent Document 1 describes a drive unit for a vehicle. The drive unit is equipped with two motors and two reduction gears and drives a pair of left and right wheels independently. Figure 1 is a block diagram showing a vehicle as viewed from above. Figure 2 is a schematic diagram showing a driving unit. Figure 3 shows an electrical circuit diagram of the driving unit. Figure 4 is a diagram showing the configuration of a lock mechanism. Figure 5 is an enlarged view of section V of Figure 2. In the first embodiment of the present technology, as described above, the drive unit is a drive unit for a vehicle that independently drives a pair of left and right wheels. The drive unit comprises a first motor for driving one side of the pair of left and right wheels, a first reduction gear for reducing the rotation of the first motor, a first inverter electrically connected to the first motor, a second motor for driving the other side of the pair of left and right wheels, a second reduction gear for reducing the rotation of the second motor, a second inverter electrically connected to the second motor, a locking mechanism for mechanically locking and unlocking the first reduction gear, and a casing housing the first motor, the first reduction gear, the first inverter, the second motor, the second reduction gear, the second inverter, and the locking mechanism, wherein the casing has a first part disposed on one side of the pair of left and right wheels and a second part disposed on the other side of the pair of left and right wheels when the drive unit is mounted on a vehicle, and the first motor, the first reduction gear, the first inverter, and the locking mechanism are the The second motor, the second reduction gear, and the second inverter are disposed in the first part of the casing, and the motor center plane dividing the space between the first motor and the second motor may be offset toward the second part of the casing with respect to the inverter center plane dividing the space between the first inverter and the second inverter. In a second embodiment of the present technology, in addition to the first embodiment, the casing may have a first oil pan provided at the bottom of the first part and a second oil pan provided at the bottom of the second part. An oil pan center plane dividing the space between the first oil pan and the second oil pan may be offset toward the first part of the casing with respect to the motor center plane. With such a configuration, the first oil pan and the second oil pan can be arranged so that the center of gravity of the entire first oil pan and the second oil pan is offset toward the first part with respect to the motor center plane. This allows for suppressing mass imbalance on the left and right sides of the drive unit. In a third embodiment of the present technology, in addition to the first or second embodiment, a first drive shaft connected to one side of the pair of left and right wheels and a second drive shaft connected to the other side of the pair of left and right wheels may be connected to the drive unit. In this case, the center of gravity of the drive unit may be located on an inboard center plane that equally divides the space between the first drive shaft inboard of the first drive shaft and the second drive shaft inboard of the second drive shaft. With such a configuration, when mounting the drive unit on a vehicle such that the center of gravity of the drive unit is located on a vehicle center plane that equally divides the space between the left wheel and the right wheel, the first drive shaft and the second drive shaft may be of equal length. By doing so, the driving performance of the vehicle can be improved. In a fourth embodiment of the present technology, in addition to any one of the first to third embodiments, the driving unit may further comprise a first terminal block fixed to the casing, a first conductive path electrically connecting the first inverter and the first motor through the first terminal block, a second terminal block fixed to the casing, and a second conductive path electrically connecting the second inverter and the second motor through the second terminal block. In this case, the total length of the first conductive path and the total length of the second conductive path may be different from each other. Meanwhile, the length of the section from the first motor to the first terminal block of the first conductive path and the length of the section from the second motor to the second terminal block of the second conductive path may be equal to each other. With such a configuration, the design can be standardized between the section from the first motor to the first terminal block of the first conductive path and the section from the second motor to the second terminal block of the second conductive path. These sections are located near the fi